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Master the math behind Kalshi vs the books

Short, practical guides on event-contract odds, no-vig calculations, and finding consistent edges. Written for sports bettors who want to understand why Kalshi prices differ from DraftKings and FanDuel, not just that they do.

Sports betting glossary

20+ plain-English definitions: vig, no-vig, edge, EV, CLV, Kelly, parlay, prop, hedge, arbitrage and more.

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6 min read

What are Kalshi odds?

A primer on Kalshi event contracts — how prices form, why they differ from sportsbook lines, and how to read them as probabilities.

4 min read

What is 'no-vig' and how is it calculated?

Sportsbooks charge a margin (the 'vig'). Here's how to strip it out and get the true implied probability of each side.

8 min read

How to spot edges between Kalshi and sportsbooks

Buy edges, sell edges, best-book selection, when 3% is real and when 5% is a data anomaly. A practical guide.

5 min read

Kalshi vs Polymarket vs PredictIt

How the major US prediction markets compare on liquidity, regulation, fees, and sports coverage.